Bit-holder for cutter-heads



(No Model.) S. J. SHIMER.

BITIHOLDBR FOR CUTTER HEADS. No. 353,509. Patented Nov. 30, 1886.

aawmwa .Attorrzey plate to splice a narrow knife.

vention consists in the novel construction of UNHED TATES ATENT @rrrce.

SAMUEL J. SHIMER, OF MILTON, PENNSYLVANIA.

BIT-HOLDER FOR CUTTER=HEADS.

SPECIFICATION forming part of Letters Patent No. 353,509, dated November30, 1886.

Application filed March 22, 1886.

To aZZ whom it may concern:

Be it known that I, SAMUEL J. SHIMER, a citizen of the United States ofAmerica, residing at Miltomin the county of Northumberland, in the Stateof Pennsylvania, have invented a new and useful Cutter-Head, of whichthe following is a specification.

My invention has relation to improvements in cutter-heads used insurface planing and molding machines, and the objects are, first, tosimplify and improve the construction of implements of the kind named,and, second, to provide ready, accurate, and reliable means foradjusting the position of the knife or knives in the cutter-head. Iattain these objects by the means and construction hereinafterdescribed, and which are illustratedin the drawings; and with these endsin view my inthe parts and their combination, as will be fully describedand especially as will be pointed out and distinctly claimed.

In the drawings, to be taken as a part hereof, I have fully and. clearlyillustrated my improvements, and reference being had thereto, Figure 1is a perspective view of a cutter-head knife-stock with my improvementsapplied. Fig. 2 is a bottom view of the holding-plate, wherein the knifeis shown in dotted lines. Fig. 3 is a transverse sectional view of theknife and holding-plate, taken on the line 00 a: of Fig. 2. Fig. 4 is aview of the knife, show,- ing'the guiding-studs. Fig. 5 is a bottom Viewof a holding-plate adapted to take a molding-knife. Fig. 6 is aview ofan auxiliary Fig. 7 is aperspective view of a removable plate withguiding-slots made V shape, and Fig. 8 is a holding-plate formed for amolding-knife.

The letter A designates the cutter-head stock, shown as made with fourplane sides, and having chip-chucks 1 formed in the angles of the stock.The stock is also provided with threaded holes in which are screwed thefastening-bolts 2. The faces of the cutter-head stock are also providedwith countersinks 3, arranged back of the line of the fasteningbolts, toserve as seats for the ends of adj usting-screws let through theclamping-plate, as hereinafter stated.

I have illustrated the cutter-head stock as one having four plain sides;but it will be ap- Serial No. 196,066. (No model.)

parent to the trade that cutter-heads of two or three sides may besubstituted with equal adaptability and utility; and that cutter-headswith surfaces arranged on different planes may have the adjusting meansapplied, (this being the primary object of the invention.) to provideconvenient means by which the knives may be readily and accuratelyadjusted in their position on the cutter-head.

The letter B designates the holding-plate, which not only serves toclamp the knife to the headstock, but also constitutes the elementhaving formed and aitixed therein the appliances and vehicles foradjusting the knives. This holding-plate is provided with two or in oreopeirended slots, 4, through which the clamping-bolts 2 are passed, andis also provided with adj listing-screws 5, the ends of which set withinthe countersinks 3 oftheheadstock for the purpose of giving accuracy tothe set of the holding-plate, and also may be used as a meansforslightly pitching the knifeedge of the plate on the knife, and thusgive additional stress where the strain is greatest, and solidity ofunion of the parts necessary. The under face of the holding-plate isformed with a wide rahbet, 6, which forms the seat for the knife, therubbet being barely as deep as the knife is thick, in order that thelatter shall set with its face flush above the wall of the rabbet and beclumped tight when the parts are in cou'ibination.

Across the face of the rabbet are out four grooves, diagonally arrangedthereon, as 7, set parallel to each other in pairs near each end of theholding-plate, thediil'erent grooves of each couple being thus adaptedto take knives of different widths, and to permit the worn knife to betaken from the longer of the grooves and set in the shorter. This isessential, since the knife in its progress forward is also movedendwisc, and would thus be moved beyond the desired limit of its strokeif kept in the longerslots. By having the shortergrooves arranged on thesame plane, with a determined interval from the longer and primarygrooves, the knife can be brought back to satisfy its end cut, byremoving it from its seat in the longer grooves and setting it in theshorter ones.

Formed in each end of the holding-plate are threaded holes 8, projectedin the plate parallel to the axis of the cutter-head, and in thesethreaded holes are fitted threaded plugs 9, a section of which projectsabove the slot a in the sides of the lower part of the holes to setagainst the end of the knife, and these plugs 9 serve as the adjustingmeans for setting the knife at any desired cut,-and then for clamping itin such position. The manipulation of the parts will be morespecifically stated in the description relating to the knife.

The letter O designates the knife, which con sists of a plane piece ofsteel of the length and breadth to suit the seat in the holdingplate. Inthe knife are arranged two studs, 10. These may be rigidly fixed in theblade, if used for a common planer-head; or may con-* sist of threadedstuds let in holes in case of a knife used in a molding head or shaper.The studs register to fit the grooves in the plate, and traverse thegrooves in the progress of the knife in its seat.

In Figs. 5, 6, 7, and 8 is shown the application of the adjusting-screwsto a moldingknife. A knife or blade of this character must move forwardin a direct line/to maintain the regularity of the shaping-edge to aline of, molding. Therefore I provide a plate, as seen in Fig. 7, withgrooves, which plate has a seat in the holding-plate; andthe studs ofthe knife set in the grooves of the'plate and the adjusting'screws setagainst theends of the plate, instead of the ends of the knife.

- This arrangement of the partsperinits the knife. to set in aprescribedbed in the holding-plate, and to move forward or back without varyingfrom a direct line of the shaped Y cut of the molding. In case the knifebecomes worn and narrowed, I provide a splioepiece to set back of and bejoined to the knife, as seen in the drawings.

The operation of the device is as follows: The knife is laid on the seatin the holdingplate with the studs in the grooves, and is then clampedby the end screws, or it may be laid in the seat and then clamped byadjusting it with the holding-plate to the headstock, after which theadjustingscrews may be operated and the knife set at such point-as maybe desired. .Now to set the knife, one of the adj usting screws isunscrewed and the other is screwed up, both being of identical thread.The result is, the knife is thrown forward or backward to the extent ofthe space covered by the movements of the screws.

From the foregoing method of adjustment, it will be perceived that theknives on the head may be adjusted with accuracy and great convenience,since the screws of one knife being given one turn, or whatever movementis required, those of the other-knives may be to secure'by LettersPatent, is

1. The combination, with a cutter-head stock, a. holding-plate removablysecured to the said stock and having a knife-seat formed thereon, and aknife provided with studs to move in diagonallyarranged grooves in itsseat, of adj usting-screws let in the ends of the holding plate, wherebythe knife may be moved forward or backward in its seat, substantially asdescribed.

I 2. The combination, with a cutter head stock and a holding-platedetachably secured thereto and formed with a knife-seat, anddiagonallyarranged grooves across the knifeseat, of a knife formed withstuds to set within the said grooves in the knifeseat and adjusting-screws let into the ends of the holding plate, whereby the knifemay be adjusted to any desired cut, substantially as described.

3. The combination, with a cutter head stock formed with countersinks onits faces, a holding-plate secured to the stock and pro vided withset-screws to set within the countersinks of the'head-stock and having aknife seat formed with diagonal grooves across its face, and a knifeformed with studs to set within the grooves of the knife-seat, ofadjustingscrews let in the ends of the holding-plate to movethe knifel.)ackward and forward, substan-:

tially as describedx at. The cutter-head knife herein described,consisting of a plate of steel formed or provided with studs 10,projected from its face, near opposite. ends of the knife, and arrangedto set in and traverse parallel guiding-grooves in the cutter-holderplate of a cutter-head, substantially as described.

5. In combination with a cutter-head anda knife thereof formed withstuds 011 its face disposed in diagonalgrooves in the holdingplate, ofadjusting-screws let into the head from both ends parallel to theknife-bed and engaging with the ends of said knife, whereby the knifemay be moved forward and backward and set at any desired cut,substantially as described.

In witness whereof I have hereunto set my hand in the presence of twoattesting witnesses.

SAMUEL J. SHIMER.

